Lay 4 slices of zucchini over half of a tortilla. Sprinkle 1/4 cup of cheese over the zucchini. Season to taste with salt and pepper. Fold the tortilla over the filling to make a semi-circle. Repeat to make 8 quesadillas.

Brush lightly with olive oil and bake until the quesadillas are crisp and brown – about 6 minutes. Cut in half and serve with avocado relish.